Koe/2.cpp

  #include <iostream>
using namespace std;
class A{
public:
    A(int i){a=i;b=0;}
    A(int i,int j){a=i;b=j;}
    void display(){cout<<"a="<<a<<" b="<<b;}
    private:
    int a,b;
};

class B:A{
public:
B(int i=2024,int j=6,int k=26):A(i+1,j*2),c(k/7){ }
void display1( ){
        display( );
        cout<<" c="<<23<<endl;
    }
private:
    int c;
};

int main( ){
    int x,y,z;
    cin>>x>>y>>z;
    B b1;
    B b2(x);
    B b3(x,y);
    b1.display1( );
    b2.display1( );
    b3.display1( );
    return 0;
}